JP5169491B2 - Battery pack monitoring device and battery breakage detection method - Google Patents

Battery pack monitoring device and battery breakage detection method Download PDF

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JP5169491B2
JP5169491B2 JP2008140197A JP2008140197A JP5169491B2 JP 5169491 B2 JP5169491 B2 JP 5169491B2 JP 2008140197 A JP2008140197 A JP 2008140197A JP 2008140197 A JP2008140197 A JP 2008140197A JP 5169491 B2 JP5169491 B2 JP 5169491B2
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voltage
auxiliary current
disconnection
current path
wiring
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JP2009288034A (en
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勝也 胡内
芳彦 水田
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GS Yuasa International Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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Description

本発明は、複数の単電池を直列に接続した組電池における各単電池の正極及び最も低電位側の単電池の負極から引き出された配線を経て各単電池の電圧を電圧測定のための設定動作を行って検出する電圧測定部と、前記電圧測定のための設定動作によって得られる検出電圧に基づいて前記配線の断線の有無を検出する断線検出部とを備えた組電池監視装置、及び、組電池用配線の断線検出方法に関する。   The present invention sets the voltage of each unit cell for voltage measurement through a wiring drawn from the positive electrode of each unit cell and the negative electrode of the unit cell on the lowest potential side in an assembled battery in which a plurality of unit cells are connected in series. An assembled battery monitoring device comprising: a voltage measuring unit that detects by performing an operation; and a disconnection detection unit that detects the presence or absence of disconnection of the wiring based on a detection voltage obtained by a setting operation for the voltage measurement; and The present invention relates to a method for detecting disconnection of a battery pack wiring.

かかる組電池監視装置は、組電池を構成する各単電池の電圧を個別に検出するための装置である。
各単電池の電圧を検出する手法としては、例えば、各単電池の正極と負極とに接続された配線の電圧を単純に計測する手法（差動アンプを用いる手法や抵抗分圧法など）の他、下記特許文献１や下記特許文献２に記載のように、各単電池と並列にコンデンサを接続して（図５参照）、各単電池の電圧で一旦コンデンサを充電し、その充電後のコンデンサの電圧を測定するという手法も考えられている。
ちなみに、このコンデンサを介して単電池の電圧を測定する手法では、各単電池の同一時間での電圧値を測定できるものとなっている。 Such an assembled battery monitoring apparatus is an apparatus for individually detecting the voltage of each single battery constituting the assembled battery.
As a method for detecting the voltage of each unit cell, for example, other than a method for simply measuring the voltage of the wiring connected to the positive electrode and the negative electrode of each unit cell (a method using a differential amplifier, a resistance voltage dividing method, etc.) As described in Patent Document 1 and Patent Document 2 below, a capacitor is connected in parallel with each unit cell (see FIG. 5), and the capacitor is temporarily charged with the voltage of each unit cell. A method of measuring the voltage of the other is also considered.
Incidentally, in the method of measuring the voltage of the single cell through this capacitor, the voltage value of each single cell at the same time can be measured.

このように各単電池の電圧を検出する場合において、この電圧検出のために組電池から引き出されている上記配線の断線が問題となる。
尚、ここでいう断線は、電気的な接続が断たれることを意味し、配線が現実に切断されてしまう場合の他、配線を接続するソケット等の接続不良によって電気的な接続が断たれる場合をも含む。 Thus, when detecting the voltage of each single cell, the disconnection of the said wiring pulled out from the assembled battery for this voltage detection becomes a problem.
In addition, the disconnection here means that the electrical connection is disconnected, and in addition to the case where the wiring is actually disconnected, the electrical connection is disconnected due to a connection failure such as a socket for connecting the wiring. This includes cases where

単電池の電圧検出のための配線に上述のような断線が発生すると、例えば、一旦コンデンサを各単電池で充電する手法では、そのコンデンサ同士は直列に接続されているので、例えば、図５において「×」記号で示す位置で配線に断線が生じても、その断線箇所を挟んだ両隣の単電池Ｖａ，Ｖｂから直列接続のコンデンサＣａ，Ｃｂへ充電されてしまうことになり、単電池Ｖａ，Ｖｂ夫々の電圧を正しく示しているわけではないコンデンサＣａ，Ｃｂの電圧を検出してしまうことになる。
このような誤検出を回避するために、下記特許文献２では、コンデンサ同士では直列に接続されている各コンデンサの容量を適宜に異ならせて、上述のような断線が発生した場合に、配線が正常に接続されている場合と、断線が発生している場合とで、コンデンサの充電電圧が異なるようにして、その電圧差によって断線の発生を検知する手法をとっている。
特開２００１−５６３５０号公報 特開２００２−２０４５３７号公報 When the disconnection as described above occurs in the wiring for voltage detection of the unit cell, for example, in the method of charging the capacitor with each unit cell once, the capacitors are connected in series. Even if a disconnection occurs in the wiring at the position indicated by the “x” symbol, the adjacent unit cells Va and Vb sandwiching the disconnection point will be charged to the series-connected capacitors Ca and Cb. The voltages of the capacitors Ca and Cb that do not correctly indicate the respective voltages of Vb are detected.
In order to avoid such erroneous detection, in Patent Document 2 below, the capacitors are connected in series with each other with different capacities as appropriate. A method is adopted in which the charging voltage of the capacitor is different between when the connection is normal and when the disconnection occurs, and the occurrence of the disconnection is detected based on the voltage difference.
JP 2001-56350 A JP 2002-204537 A

しかしながら、上記特許文献２による断線の検出手法では、正常な場合の検出電圧と断線が発生した場合の検出電圧との電圧差が十分ではない場合もあり、改善が求められていた。
更に、以上は、各単電池の電圧をコンデンサを介して検出する場合を例示して、断線が発生した場合の問題点を説明したが、例えば各単電池の電圧を直接に電圧測定部にて測定する場合にも配線の断線によって同様の問題が生じる。
すなわち、上述のコンデンサを、電圧測定部における検出電圧入力端子間で入力インピーダンスに置き換えて考えて、その入力インピーダンスで分圧された電圧を検出してしまう場合がある。又、上記の各単電池から電圧測定部に至る配線間にノイズ吸収用のコンデンサを接続する場合も同様の問題が生じる。
本発明は、かかる実情に鑑みてなされたものであって、その目的は、各単電池の電圧を検出するための配線に断線が発生した場合に、その断線を的確に検出できるようにする点にある。 However, in the disconnection detection method according to Patent Document 2, the voltage difference between the detection voltage in the normal case and the detection voltage in the case where the disconnection occurs may not be sufficient, and improvement has been demanded.
Furthermore, the above describes the case where the disconnection occurs by exemplifying the case where the voltage of each unit cell is detected via a capacitor. For example, the voltage of each unit cell is directly measured by the voltage measuring unit. In the case of measurement, the same problem occurs due to the disconnection of the wiring.
That is, the above-described capacitor may be replaced with an input impedance between detection voltage input terminals in the voltage measurement unit, and a voltage divided by the input impedance may be detected. The same problem arises when a noise absorbing capacitor is connected between the wirings from each cell to the voltage measuring section.
The present invention has been made in view of such circumstances, and an object thereof is to make it possible to accurately detect the disconnection when a disconnection occurs in the wiring for detecting the voltage of each unit cell. It is in.

本出願の第１の発明は、複数の単電池を直列に接続した組電池における各単電池の正極及び最も低電位側の単電池の負極から引き出された配線を経て各単電池の電圧を電圧測定のための設定動作を行って検出する電圧測定部と、前記電圧測定のための設定動作によって得られる検出電圧に基づいて前記配線の断線の有無を検出する断線検出部とを備えた組電池監視装置において、前記単電池の夫々と並列に設定抵抗値を有する補助電流経路が接続され、前記補助電流経路の夫々における通電を入り切りする補助電流経路用のスイッチ装置が前記補助電流経路の夫々に備えられ、前記断線検出部は、前記補助電流経路用のスイッチ装置を、電位での並び順において隣り合うものが同時に閉じ状態とならないように開閉操作し、且つ、前記電圧測定のための設定動作によって得られる前記補助電流経路用のスイッチ装置を閉じ状態としたときの検出電圧と前記補助電流経路用のスイッチ装置を開き状態としたときの検出電圧との差に基づいて、前記配線の断線の有無を検出するように構成されている。 In the first invention of the present application, the voltage of each unit cell is connected to a voltage extracted from the positive electrode of each unit cell and the negative electrode of the unit cell on the lowest potential side in an assembled battery in which a plurality of unit cells are connected in series. A battery pack comprising: a voltage measuring unit that detects by performing a setting operation for measurement; and a disconnection detecting unit that detects the presence or absence of disconnection of the wiring based on a detection voltage obtained by the setting operation for voltage measurement In the monitoring device, an auxiliary current path having a set resistance value is connected in parallel with each of the unit cells, and a switch device for the auxiliary current path for turning on and off the current in each of the auxiliary current paths is provided for each of the auxiliary current paths. The disconnection detection unit opens and closes the auxiliary current path switch device so that adjacent devices in the arrangement order of potentials are not simultaneously closed, and the voltage measurement is performed. Based on the difference between the detected voltage configuration and the closed state switching device for the auxiliary current path is that obtained by the operation was a detection voltage when the when the opened state of the switching device for the auxiliary current path for , And configured to detect the presence or absence of disconnection of the wiring.

すなわち、組電池と電圧測定部とを結ぶ配線の何れの箇所にも断線が生じていなければ、各単電池と並列に接続される補助電流経路のスイッチ装置を閉じ状態としてもあるいは開き状態としても、配線上の電圧は基本的には変化がなく、各単電池の電圧が電圧測定部による検出にかかることになる。
一方、断線が発生しているときには、補助電流経路用のスイッチ装置を閉じ状態として、補助電流経路に通電させると、電圧測定部の検出にかかる電圧値は十分に低くなる。 In other words, if there is no disconnection in any part of the wiring connecting the assembled battery and the voltage measuring unit, the auxiliary current path switch device connected in parallel with each unit cell may be closed or opened. The voltage on the wiring basically has no change, and the voltage of each single cell is detected by the voltage measuring unit.
On the other hand, when the disconnection occurs, when the auxiliary current path switch device is closed and the auxiliary current path is energized, the voltage value required for detection by the voltage measuring unit is sufficiently low.

更に具体的な例によって説明すると、単電池の電圧をコンデンサを介して測定する手法では、図６（ａ）に概略的に示すように、図６（ａ）に「×」記号で断線が発生しているときに、単電池Ｖａに対応する補助電流経路用のスイッチＳａを閉じ状態とした状態で、電圧測定のための設定動作を行わせる。
ここでの電圧測定のための設定動作は、スイッチＰａ，Ｐｂ，Ｐｃを閉じ状態にして単電池Ｖａ，ＶｂでコンデンサＣａ，Ｃｂに充電させた後、コンデンサＣａ，Ｃｂの電圧を測定する。
このとき、スイッチＳａを閉じ状態としているので、コンデンサＣｂには単電池Ｖａ，Ｖｂで充電されるものの、コンデンサＣａには充電されない（厳密には、コンデンサＣａは瞬時的には充電されるが、充電されていない定常状態へ移行する）。
逆に、単電池Ｖｂに対応する補助電流経路用のスイッチＳｂを閉じ状態とした状態で、同様の電圧測定のための設定動作を行わせると、コンデンサＣａには単電池Ｖａ，Ｖｂで充電されるものの、コンデンサＣｂには充電されない（厳密には、コンデンサＣｂは瞬時的には充電されるが、充電されていない定常状態へ移行する）。
これによって、断線が発生しているときは、補助電流経路用のスイッチ装置を閉じ状態として電圧測定を行ったかあるいは開き状態として電圧測定を行ったかによって測定電圧に大きな開きが発生する。 More specifically, in the method of measuring the voltage of a single cell through a capacitor, as shown schematically in FIG. 6 (a), a disconnection occurs at the “x” symbol in FIG. 6 (a). In this state, the setting operation for voltage measurement is performed in a state where the switch Sa for the auxiliary current path corresponding to the unit cell Va is closed.
In this setting operation for voltage measurement, the switches Pa, Pb, and Pc are closed, and the capacitors Ca and Cb are charged by the single cells Va and Vb, and then the voltages of the capacitors Ca and Cb are measured.
At this time, since the switch Sa is in a closed state, the capacitor Cb is charged by the single cells Va and Vb, but the capacitor Ca is not charged (strictly speaking, the capacitor Ca is instantaneously charged, Transition to a steady state that is not charged).
On the contrary, when the same setting operation for voltage measurement is performed with the auxiliary current path switch Sb corresponding to the unit cell Vb closed, the capacitor Ca is charged by the unit cells Va and Vb. However, the capacitor Cb is not charged (strictly speaking, the capacitor Cb is instantaneously charged, but shifts to an uncharged steady state).
As a result, when disconnection occurs, a large opening occurs in the measured voltage depending on whether the voltage measurement is performed with the auxiliary current path switch device closed or the voltage measurement is performed with the auxiliary current path switch device opened.

更に、各単電池の電圧を直接に電圧測定部にて測定する場合では、図６（ｂ）に概略的に示すように、図６（ｂ）に「×」記号で断線が発生しているときに、単電池Ｖａに対応する補助電流経路用のスイッチＳａを閉じ状態とした状態で、電圧測定のための設定動作を行わせる。
ここでの電圧測定のための設定動作は、単にスイッチＰａ，Ｐｂ，Ｐｃを閉じ状態にして単電池Ｖａ，Ｖｂの電圧を測定する。
このとき、スイッチＳａを閉じ状態としており、電圧測定部の入力インピーダンス（図６（ｂ）においてＲｉで示す）は非常に高いので、単電池Ｖｂの電圧を検出するための入力端子にはほぼ単電池Ｖａ，Ｖｂの電圧を足し合わせた電圧が検出にかかり、単電池Ｖａの電圧を検出するための入力端子には非常に小さい電圧が検出にかかるだけとなる。
逆に、単電池Ｖｂに対応する補助電流経路用のスイッチＳｂを閉じ状態とした状態で、同様の電圧測定のための設定動作を行わせると、単電池Ｖａの電圧を検出するための入力端子にはほぼ単電池Ｖａ，Ｖｂの電圧を足し合わせた電圧が検出にかかり、単電池Ｖｂの電圧を検出するための入力端子には非常に小さい電圧が検出にかかるだけとなる。
これによって、断線が発生しているときは、補助電流経路用のスイッチ装置を閉じ状態として電圧測定を行ったかあるいは開き状態として電圧測定を行ったかによって測定電圧に大きな開きが発生する。 Further, in the case where the voltage of each single cell is directly measured by the voltage measuring unit, as schematically shown in FIG. 6 (b), a disconnection has occurred at the “x” symbol in FIG. 6 (b). Sometimes, the setting operation for voltage measurement is performed in a state where the switch Sa for the auxiliary current path corresponding to the unit cell Va is in a closed state.
In this setting operation for voltage measurement, the switches Pa, Pb, Pc are simply closed and the voltages of the single cells Va, Vb are measured.
At this time, the switch Sa is in a closed state, and the input impedance of the voltage measurement unit (indicated by Ri in FIG. 6B) is very high, so that the input terminal for detecting the voltage of the unit cell Vb is almost single. A voltage obtained by adding the voltages of the batteries Va and Vb is applied to the detection, and a very small voltage is only applied to the input terminal for detecting the voltage of the single cell Va.
On the contrary, when the same setting operation for voltage measurement is performed in the state where the switch Sb for the auxiliary current path corresponding to the unit cell Vb is closed, the input terminal for detecting the voltage of the unit cell Va. Therefore, a voltage obtained by adding the voltages of the single cells Va and Vb is applied to the detection, and a very small voltage is applied to the input terminal for detecting the voltage of the single cell Vb.
As a result, when disconnection occurs, a large opening occurs in the measured voltage depending on whether the voltage measurement is performed with the auxiliary current path switch device closed or the voltage measurement is performed with the auxiliary current path switch device opened.

以上のように、断線が発生した箇所に連なる単電池の電圧測定の結果が非常に小さい電圧値となることで、電圧値が小さいということ自体によっても断線の発生を検知できるのであるが、実際の測定電圧と判別値との関係等によっては断線の有無の判断が不安定となるような場合もあり得る。そのような場合には、補助電流経路用のスイッチ装置を開き状態として電圧検出を行った場合に高い電圧値になることも利用して、補助電流経路用のスイッチ装置を開き状態としたときの検出電圧値と閉じ状態としたときの検出電圧値との差をとって、その差によって断線の有無を判断することで、より精度の高い断線の有無の判定を行うことも可能である。
又、このように、単電池毎の電圧測定動作によって得られる電圧値で断線の有無を判断するので、断線の発生位置が測定対象の単電池からの配線上であることを特定でき、特に、直列に並ぶ２つの単電池についての電圧測定動作の測定結果が得られて、その何れもが断線の発生を示すものであるような場合では、その２つの単電池の接続箇所からの配線上で断線が発生しているものと推定できる。 As described above, since the voltage measurement result of the single cells connected to the location where the disconnection has occurred becomes a very small voltage value, the occurrence of the disconnection can be detected by the fact that the voltage value itself is small, Depending on the relationship between the measured voltage and the discriminant value, the determination of the presence or absence of disconnection may become unstable. In such a case, when the voltage detection is performed with the switch device for the auxiliary current path opened, the high voltage value is also used, and the switch device for the auxiliary current path is opened. It is also possible to determine the presence / absence of disconnection with higher accuracy by taking the difference between the detected voltage value and the detected voltage value when the closed state is established, and determining the presence / absence of disconnection based on the difference.
In addition, in this way, since the presence or absence of disconnection is determined by the voltage value obtained by the voltage measurement operation for each unit cell, it is possible to specify that the occurrence position of disconnection is on the wiring from the unit cell to be measured. In the case where the measurement result of the voltage measurement operation for two unit cells arranged in series is obtained, and both of them indicate the occurrence of disconnection, on the wiring from the connection point of the two unit cells It can be estimated that a disconnection has occurred.

又、本出願の第２の発明は、複数の単電池を直列に接続した組電池における各単電池の正極及び最も低電位側の単電池の負極から引き出された配線を経て各単電池の電圧を電圧測定のための設定動作を行って検出し、前記電圧測定のための設定動作によって得られる検出電圧に基づいて前記配線の断線の有無を検出する組電池用配線の断線検出方法において、前記単電池の夫々と並列に設定抵抗値を有する補助電流経路が接続され、前記補助電流経路の夫々における通電を入り切りする補助電流経路用のスイッチ装置が前記補助電流経路の夫々に備えられ、前記補助電流経路用のスイッチ装置を、電位での並び順において隣り合うものが同時に閉じ状態とならないように開閉操作し、且つ、前記電圧測定のための設定動作によって得られる前記補助電流経路用のスイッチ装置を閉じ状態としたときの検出電圧と前記補助電流経路用のスイッチ装置を開き状態としたときの検出電圧との差に基づいて、前記配線の断線の有無を検出する。 Further, the second invention of the present application is that the voltage of each unit cell is connected through a wiring drawn from the positive electrode of each unit cell and the negative electrode of the unit cell on the lowest potential side in an assembled battery in which a plurality of unit cells are connected in series. In the disconnection detection method for an assembled battery wiring, the detection is performed by performing a setting operation for voltage measurement, and the presence or absence of disconnection of the wiring is detected based on a detection voltage obtained by the setting operation for voltage measurement. An auxiliary current path having a set resistance value is connected in parallel with each of the cells, and a switch device for the auxiliary current path for turning on and off the current in each of the auxiliary current paths is provided in each of the auxiliary current paths, and the auxiliary current path the switching device for the current path, those adjacent to each other in the sort order is opened and closed so as not to be a closed state at the same time in the potential, and the voltage setting before Ru obtained by the operation for the measurement Based on the difference between the detected voltage when the open state of the detection voltage and the switch device for the auxiliary current path when the state closes the switch device for the auxiliary current path, for detecting the presence or absence of disconnection of the wiring .

すなわち、上記第１の発明について説明したように、断線が発生しているときは、補助電流経路用のスイッチ装置を閉じ状態として電圧測定を行ったかあるいは開き状態として電圧測定を行ったかによって測定電圧に大きな開きが発生し、それによって断線の有無を検知できる。   That is, as described in the first aspect, when a disconnection occurs, the measured voltage depends on whether the voltage measurement is performed with the auxiliary current path switch device closed or the voltage measurement is performed open. A large opening occurs, and it is possible to detect the presence or absence of disconnection.

上記第１の発明によれば、断線が発生しているときは、補助電流経路用のスイッチ装置を閉じ状態として電圧測定を行ったかあるいは開き状態として電圧測定を行ったかによって測定電圧に大きな開きが発生するので、各単電池の電圧を検出するための配線に断線が発生した場合に、その断線を的確に検出できるものとなった。
又、上記第２の発明によれば、断線が発生しているときは、補助電流経路用のスイッチ装置を閉じ状態として電圧測定を行ったかあるいは開き状態として電圧測定を行ったかによって測定電圧に大きな開きが発生し、それによって断線の有無を検知するので、各単電池の電圧を検出するための配線に断線が発生した場合に、その断線を的確に検出できるものとなった。 According to the first aspect of the present invention, when a disconnection occurs, there is a large difference in the measured voltage depending on whether the voltage measurement is performed with the auxiliary current path switch device closed or the voltage measurement is performed open. Therefore, when disconnection occurs in the wiring for detecting the voltage of each unit cell, the disconnection can be accurately detected.
According to the second aspect of the present invention, when the disconnection occurs, the measured voltage is large depending on whether the voltage measurement is performed with the auxiliary current path switch device closed or the voltage measurement is performed open. Since the opening occurs and the presence or absence of disconnection is detected, the disconnection can be accurately detected when the disconnection occurs in the wiring for detecting the voltage of each unit cell.

以下、本発明の組電池監視装置の実施の形態を図面に基づいて説明する。
図１は、組電池１と組電池監視装置ＶＳとを回路的に接続した状態の回路構成を示している。
〔組電池１の構成〕
組電池１は複数の単電池１ａ，１ｂ，１ｃ，１ｄを直列に接続して構成したものであり、本実施の形態では、説明の便宜上、４個の単電池１ａ，１ｂ，１ｃ，１ｄを直列に接続した場合を例示して説明する。但し、実際には、もっと多数の単電池を直列に接続して組電池を構成している。単電池１ａ，１ｂ，１ｃ，１ｄは二次電池の１例であるリチウムイオン電池であるが、このような二次電池に限らず各種の組電池に本発明を適用できる。 Embodiments of an assembled battery monitoring device according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a circuit configuration in a state where the assembled battery 1 and the assembled battery monitoring device VS are connected in a circuit.
[Configuration of assembled battery 1]
The assembled battery 1 is configured by connecting a plurality of unit cells 1a, 1b, 1c, and 1d in series. In this embodiment, for convenience of explanation, four unit cells 1a, 1b, 1c, and 1d are provided. A case where they are connected in series will be described as an example. However, in practice, an assembled battery is configured by connecting a larger number of single cells in series. The unit cells 1a, 1b, 1c, and 1d are lithium ion batteries that are examples of secondary batteries. However, the present invention is not limited to such secondary batteries but can be applied to various assembled batteries.

〔組電池監視装置ＶＳの構成〕
組電池監視装置ＶＳは、各単電池１ａ，１ｂ，１ｃ，１ｄに対してコンデンサ２ａ，２ｂ，２ｃ，２ｄを並列に接続して、各単電池１ａ，１ｂ，１ｃ，１ｄの電池電圧で夫々に対応するコンデンサ２ａ，２ｂ，２ｃ，２ｄを充電し、充電を完了したコンデンサ２ａ，２ｂ，２ｃ，２ｄの電圧を順次に検出して行く形態をとる。
各単電池１ａ，１ｂ，１ｃ，１ｄの正極側とコンデンサ２ａ，２ｂ，２ｃ，２ｄの夫々との配線の途中箇所には、その配線の通電を入り切りして、各単電池１ａ，１ｂ，１ｃ，１ｄで対応するコンデンサ２ａ，２ｂ，２ｃ，２ｄを充電するか否かを切換える複数（４個）の正極配線用のスイッチ装置３ａ，３ｂ，３ｃ，３ｄが配置されている。
この機能を果たすため、正極配線用のスイッチ装置３ａ，３ｂ，３ｃ，３ｄは、コンデンサ２ａ，２ｂ，２ｃ，２ｄよりも組電池１に近い側（各単電池で見ると高電位側）に配置されている。
本実施の形態では、この正極配線用のスイッチ装置３ａ，３ｂ，３ｃ，３ｄはアナログスイッチにて構成されており、後述の各部のスイッチ装置についても同様で、全てをアナログスイッチにて構成する場合を例示している。 [Configuration of assembled battery monitoring device VS]
In the assembled battery monitoring device VS, capacitors 2a, 2b, 2c, and 2d are connected in parallel to the single cells 1a, 1b, 1c, and 1d, and the battery voltages of the single cells 1a, 1b, 1c, and 1d are respectively used. The capacitors 2a, 2b, 2c, and 2d corresponding to the above are charged, and the voltages of the capacitors 2a, 2b, 2c, and 2d that have been charged are sequentially detected.
The single cells 1a, 1b, 1c, and 1d are turned on and off at intermediate points in the wiring between the positive electrodes of the single cells 1a, 1b, 1c, and 1d and the capacitors 2a, 2b, 2c, and 2d. , 1d, a plurality of (four) switch devices 3a, 3b, 3c, 3d for positive electrode wiring for switching whether to charge the corresponding capacitors 2a, 2b, 2c, 2d are arranged.
In order to fulfill this function, the switch devices 3a, 3b, 3c, 3d for positive wiring are arranged closer to the assembled battery 1 than the capacitors 2a, 2b, 2c, 2d (high potential side when viewed from each single cell). Has been.
In the present embodiment, the switch devices 3a, 3b, 3c, 3d for the positive electrode wiring are configured by analog switches, and the same applies to the switch devices of each part described later, and all are configured by analog switches. Is illustrated.

更に、スイッチ装置４ａ，４ｂ，４ｃ，４ｄと抵抗５ａ，５ｂ，５ｃ，５ｄとが直列に接続されて構成される補助電流経路６ａ，６ｂ，６ｃ，６ｄが、各単電池１ａ，１ｂ，１ｃ，１ｄの夫々と並列に接続されている。
この補助電流経路６ａ，６ｂ，６ｃ，６ｄは、本来、各単電池１ａ，１ｂ，１ｃ，１ｄ間で電圧ばらつきが発生したときに、電圧の高い単電池を放電させて各単電池１ａ，１ｂ，１ｃ，１ｄの電圧をバランスさせるための回路部分であるが、後述するように、配線に断線が生じているか否かの検出にも用いている。
この補助電流経路６ａ，６ｂ，６ｃ，６ｄは、正極配線用のスイッチ装置３ａ，３ｂ，３ｃ，３ｄよりも組電池１に近い側において、各単電池１ａ，１ｂ，１ｃ，１ｄと並列に接続されている。
尚、補助電流経路６ａ，６ｂ，６ｃ，６ｄに備えられて、補助電流経路６ａ，６ｂ，６ｃ，６ｄの夫々における通電を入り切りするスイッチ装置４ａ，４ｂ，４ｃ，４ｄを、説明の便宜上、補助電流経路用のスイッチ装置４ａ，４ｂ，４ｃ，４ｄと称する。 Furthermore, the auxiliary current paths 6a, 6b, 6c, 6d configured by connecting the switch devices 4a, 4b, 4c, 4d and the resistors 5a, 5b, 5c, 5d in series include the single cells 1a, 1b, 1c. , 1d are connected in parallel.
The auxiliary current paths 6a, 6b, 6c, and 6d originally discharge the high-voltage cells when the voltage variation occurs between the cells 1a, 1b, 1c, and 1d, and the cells 1a, 1b. , 1c, and 1d are circuit portions for balancing the voltages, but are also used to detect whether or not the wiring is disconnected, as will be described later.
The auxiliary current paths 6a, 6b, 6c and 6d are connected in parallel to the single cells 1a, 1b, 1c and 1d on the side closer to the assembled battery 1 than the switch devices 3a, 3b, 3c and 3d for positive wiring. Has been.
Note that the switch devices 4a, 4b, 4c, and 4d that are provided in the auxiliary current paths 6a, 6b, 6c, and 6d and turn on and off the auxiliary current paths 6a, 6b, 6c, and 6d are provided for convenience of explanation. They are referred to as current path switching devices 4a, 4b, 4c, and 4d.

各コンデンサ２ａ，２ｂ，２ｃ，２ｄの高電位側は、マイクロプロセッサ１０により構成される電圧測定部ＭＵの電圧測定端子に接続されている。
図１においては、コンデンサ２ａの電圧を測定するための電圧測定端子を「Ａ／Ｄ１」，コンデンサ２ｂの電圧を測定するための電圧測定端子を「Ａ／Ｄ２」，コンデンサ２ｃの電圧を測定するための電圧測定端子を「Ａ／Ｄ３」，コンデンサ２ｄの電圧を測定するための電圧測定端子を「Ａ／Ｄ４」として示している。
更に、電位での並び順において最も低電位側のコンデンサ２ａの低電位側（負極側）は、マイクロプロセッサ１０のグラウンド端子（「ＧＮＤ」）へ接続されている。
マイクロプロセッサ１０の電圧測定端子は、内蔵しているＡ／Ｄコンバータの入力端子となっており、マイクロプロセッサ１０は、各電圧測定端子と「ＧＮＤ」端子との間の電位差を検出する。 The high potential side of each capacitor 2 a, 2 b, 2 c, 2 d is connected to a voltage measurement terminal of a voltage measurement unit MU configured by the microprocessor 10.
In FIG. 1, the voltage measurement terminal for measuring the voltage of the capacitor 2a is “A / D1”, the voltage measurement terminal for measuring the voltage of the capacitor 2b is “A / D2”, and the voltage of the capacitor 2c is measured. A voltage measurement terminal for measuring the voltage of the capacitor 2d is indicated as “A / D3”, and a voltage measurement terminal for measuring the voltage of the capacitor 2d is indicated as “A / D4”.
Further, the low potential side (negative electrode side) of the capacitor 2a on the lowest potential side in the arrangement order of potentials is connected to the ground terminal (“GND”) of the microprocessor 10.
The voltage measurement terminal of the microprocessor 10 is an input terminal of the built-in A / D converter, and the microprocessor 10 detects a potential difference between each voltage measurement terminal and the “GND” terminal.

各コンデンサ２ｂ，２ｃ，２ｄ（コンデンサ２ａを除く）の高電位側からマイクロプロセッサ１０の電圧測定端子に至る配線の途中には、測定動作用のスイッチ装置８ａ，８ｂ，８ｃが接続されており、「Ａ／Ｄ２」，「Ａ／Ｄ３」及び「Ａ／Ｄ４」の電圧測定端子には、電圧測定動作時にのみ電圧が印加されるようにしている。
各コンデンサ２ａ，２ｂ，２ｃ（コンデンサ２ｄを除く）の高電位側からマイクロプロセッサ１０の電圧測定端子に至る配線の途中には、更に、各配線をグラウンド（組電池１の最も低電位側）に接続するためのグラウンド接続用のスイッチ装置７ａ，７ｂ，７ｃが接続されている。
グラウンド接続用のスイッチ装置７ａ，７ｂ，７ｃは、電圧測定時に、上記の電圧測定端子に不要な高電圧が印加されるのを回避するためのものであり、詳しくは後述する。
以上説明した回路構成を有する組電池監視装置ＶＳの回路基板は、ケーブル１１を介して組電池１と接続されている。
換言すると、各単電池１ａ，１ｂ，１ｃ，１ｄの正極及び最も低電位側の単電池１ａの負極から引き出された配線（ケーブル１１を含む）を経て電圧測定部ＭＵが各単電池１ａ，１ｂ，１ｃ，１ｄの電圧を検出する。
現実問題として、配線の断線は、ケーブル１１内、ケーブル１１と組電池１との接続用コネクタ、あるいは、ケーブル１１と組電池監視装置ＶＳの上記回路基板との接続用コネクタで発生する場合がほとんどである。 Switch devices 8a, 8b, 8c for measurement operation are connected in the middle of the wiring from the high potential side of the capacitors 2b, 2c, 2d (excluding the capacitor 2a) to the voltage measurement terminal of the microprocessor 10, The voltage is applied to the voltage measurement terminals “A / D2”, “A / D3”, and “A / D4” only during the voltage measurement operation.
In the middle of the wiring from the high potential side of each capacitor 2a, 2b, 2c (excluding the capacitor 2d) to the voltage measurement terminal of the microprocessor 10, each wiring is further connected to the ground (the lowest potential side of the assembled battery 1). Switch devices 7a, 7b and 7c for ground connection for connection are connected.
The ground connection switch devices 7a, 7b, and 7c are for preventing an unnecessary high voltage from being applied to the voltage measurement terminal during voltage measurement, and will be described in detail later.
The circuit board of the assembled battery monitoring device VS having the circuit configuration described above is connected to the assembled battery 1 via the cable 11.
In other words, the voltage measuring unit MU passes through the wiring (including the cable 11) drawn from the positive electrode of each unit cell 1a, 1b, 1c, 1d and the negative electrode of the unit cell 1a on the lowest potential side. , 1c, 1d are detected.
As a practical problem, the disconnection of the wiring is almost always generated in the cable 11, the connector for connecting the cable 11 and the assembled battery 1, or the connector for connecting the cable 11 and the circuit board of the assembled battery monitoring device VS. It is.

〔断線の検出動作〕
次ぎに、断線の検出動作について説明する。
断線の検出動作は、マイクロプロセッサ１０が図３のフローチャートに示す処理を実行することにより行い、マイクロプロセッサ１０は、配線の断線の有無を検出する断線検出部ＣＣとしても機能する。
以下、図３のフローチャートと図２のタイミングチャートによって動作を説明する。 [Detection of disconnection]
Next, the disconnection detection operation will be described.
The disconnection detection operation is performed by the microprocessor 10 executing the processing shown in the flowchart of FIG. 3, and the microprocessor 10 also functions as a disconnection detection unit CC that detects the presence or absence of the disconnection of the wiring.
The operation will be described below with reference to the flowchart of FIG. 3 and the timing chart of FIG.

マイクロプロセッサ１０は、先ず、電位での並び順で低電位側から奇数番目（１番目と３番目）の補助電流経路６ａ，６ｃに備えられている補助電流経路用のスイッチ装置４ａ，４ｃを予め設定された時間の間だけ閉じ状態（ＯＮ状態）とし、電位での並び順で低電位側から偶数番目（２番目と４番目）の補助電流経路６ｂ，６ｄに備えられている補助電流経路用のスイッチ装置４ｂ，４ｄは開き状態（ＯＦＦ状態）を維持させる。
図１に示すように、奇数番目の補助電流経路用のスイッチ装置４ａ，４ｃは、マイクロプロセッサ１０の制御信号出力端子「ＳＣ１」の出力信号によって一括して開閉操作され、偶数番目の補助電流経路用のスイッチ装置４ｂ，４ｄは、マイクロプロセッサ１０の制御信号出力端子「ＳＣ２」の出力信号によって一括して開閉操作される。 First, the microprocessor 10 preliminarily includes auxiliary current path switch devices 4a and 4c provided in odd-numbered (first and third) auxiliary current paths 6a and 6c from the low potential side in the order of arrangement in terms of potential. For the auxiliary current path provided in the even-numbered (second and fourth) auxiliary current paths 6b and 6d from the low potential side in the arrangement order of potentials for the set time only. The switch devices 4b and 4d are maintained in the open state (OFF state).
As shown in FIG. 1, the switch devices 4a and 4c for odd-numbered auxiliary current paths are collectively opened and closed by the output signal of the control signal output terminal “SC1” of the microprocessor 10, and the even-numbered auxiliary current paths The switch devices 4b and 4d for use are collectively opened and closed by the output signal of the control signal output terminal “SC2” of the microprocessor 10.

図２における「ＳＣ１」，「ＳＣ２」のパルス信号は、その記号の制御信号出力端子から出力されるパルス信号を示しており、パルス信号のＨレベル側で、各スイッチ装置４ａ，４ｂ，４ｃ，４ｄが閉じ状態（ＯＮ状態）となり、パルス信号のＬレベル側で、各スイッチ装置４ａ，４ｂ，４ｃ，４ｄが開き状態（ＯＦＦ状態）となる。これは、以下で説明する各スイッチ装置の制御のためのパルス信号についても同様である。
従って、図３のステップ＃１のために、図２の「ＳＣ１」で設定期間のパルス信号が出力され、その期間「ＳＣ２」ではＬレベルを維持している。説明の便宜上、この補助電流経路用のスイッチ装置４ａ，４ｂ，４ｃ，４ｄの設定状態を第１スイッチ設定状態と称する。
このように、電位での並び順において奇数番目の補助電流経路用のスイッチ装置４ａ，４ｃと偶数番目の補助電流経路用のスイッチ装置４ｂ，４ｄとを、夫々一括して開閉操作し、且つ、後述のように開閉状態が交互となるようにしているのは、電位での並び順において隣合うものが同時に閉じ状態とならないようにするためである。 The pulse signals “SC1” and “SC2” in FIG. 2 indicate pulse signals output from the control signal output terminal of the symbol, and each switch device 4a, 4b, 4c, 4d is in a closed state (ON state), and each switch device 4a, 4b, 4c, 4d is in an open state (OFF state) on the L level side of the pulse signal. The same applies to pulse signals for controlling each switch device described below.
Therefore, for step # 1 in FIG. 3, the pulse signal of the set period is output in “SC1” in FIG. 2, and the L level is maintained in that period “SC2”. For convenience of explanation, the setting state of the switch devices 4a, 4b, 4c, and 4d for the auxiliary current path is referred to as a first switch setting state.
In this way, the switch devices 4a and 4c for odd-numbered auxiliary current paths and the switch devices 4b and 4d for even-numbered auxiliary current paths in the arrangement order of potentials are collectively opened and closed, and The reason why the open / close states are alternated as described later is to prevent the adjacent ones from being simultaneously closed in the arrangement order of potentials.

断線検出部ＣＣとして機能するマイクロプロセッサ１０は、次ぎに電圧測定部ＭＵに対して各単電池１ａ，１ｂ，１ｃ，１ｄの電圧測定のための設定動作の開始を指示する（ステップ＃２）。
マイクロプロセッサ１０の電圧測定部ＭＵとしての機能は、いわゆるサブルーチンとして実装されており、ステップ＃２でそのサブルーチンを呼び出して処理させる。
電圧測定部ＭＵは、電圧測定のための設定動作の開始を指示されると、図２において「第１測定サイクル」として示す範囲の動作を実行する。 Next, the microprocessor 10 functioning as the disconnection detecting unit CC instructs the voltage measuring unit MU to start a setting operation for measuring the voltages of the single cells 1a, 1b, 1c, and 1d (step # 2).
The function of the microprocessor 10 as the voltage measuring unit MU is implemented as a so-called subroutine, and the subroutine is called and processed in step # 2.
When the voltage measurement unit MU is instructed to start a setting operation for voltage measurement, the voltage measurement unit MU performs an operation in a range indicated as “first measurement cycle” in FIG. 2.

すなわち、図１に「ＨＣ」で示す制御信号出力端子から図２で「ＨＣ」として示すパルス信号を送る。
「ＨＣ」の制御信号は、正極配線用のスイッチ装置３ａ，３ｂ，３ｃ，３ｄの開閉操作を一括して制御するもので、この信号によって正極配線用のスイッチ装置３ａ，３ｂ，３ｃ，３ｄが一斉に閉じ状態となり、各単電池１ａ，１ｂ，１ｃ，１ｄから夫々が対応する各コンデンサ２ａ，２ｂ，２ｃ，２ｄへの充電が開始される。
この後、各コンデンサ２ａ，２ｂ，２ｃ，２ｄへの充電が完了し、正極配線用のスイッチ装置３ａ，３ｂ，３ｃ，３ｄが開き状態とした後に、図２の「Ａ／Ｄ１」〜「Ａ／Ｄ４」で示すパルス信号のタイミングで、夫々が示す電圧測定端子に入力されている電圧をＡ／Ｄ変換して読取っていく。
図２に示すパルス信号からわかるように、電位での並び順において低電位側のコンデンサ２ａから順次に電圧を検出している。 That is, a pulse signal indicated as “HC” in FIG. 2 is sent from the control signal output terminal indicated by “HC” in FIG.
The control signal “HC” is used to collectively control the opening / closing operation of the switch devices 3a, 3b, 3c, 3d for positive wiring, and the switch devices 3a, 3b, 3c, 3d for positive wiring are controlled by this signal. The battery is closed at the same time, and charging from the unit cells 1a, 1b, 1c, and 1d to the corresponding capacitors 2a, 2b, 2c, and 2d is started.
Thereafter, after charging of the capacitors 2a, 2b, 2c, 2d is completed and the switch devices 3a, 3b, 3c, 3d for positive wiring are opened, “A / D1” to “A” in FIG. At the timing of the pulse signal indicated by “/ D4”, the voltage input to the voltage measuring terminal indicated by each is A / D converted and read.
As can be seen from the pulse signal shown in FIG. 2, the voltage is sequentially detected from the capacitor 2a on the low potential side in the arrangement order of potentials.

この電圧の読取り動作と並行して、各コンデンサ２ａ，２ｂ，２ｃ（最も高電位側のコンデンサ２ｄを除く）について、電圧の読取りが終了したタイミングでそのコンデンサ２ａ，２ｂ，２ｃの高電位側の配線に接続されているグラウンド接続用のスイッチ装置７ａ，７ｂ，７ｃを閉じ状態として、電圧の読取りが完了したコンデンサ２ａ，２ｂ，２ｃの高電位側をグラウンドに落として放電させ、更にそれに引き続いて、次ぎに測定対象となるコンデンサ２ｂ，２ｃ，２ｄの高電位側の配線に備えられている測定動作用のスイッチ装置８ａ，８ｂ，８ｃを閉じ状態として、マイクロプロセッサ１０による電圧測定が可能な状態とする。マイクロプロセッサ１０の電圧測定端子での電圧読取りのタイミングは、測定動作用のスイッチ装置８ａ，８ｂ，８ｃが閉じ状態になってから若干遅れたタイミングに設定してある。   In parallel with this voltage reading operation, each capacitor 2a, 2b, 2c (excluding the capacitor 2d on the highest potential side) has a high potential side of the capacitor 2a, 2b, 2c at the timing when the voltage reading is completed. The switch devices 7a, 7b, 7c for ground connection connected to the wiring are closed, and the high potential side of the capacitors 2a, 2b, 2c, whose voltage has been read, are dropped to the ground, and then discharged. Next, a state in which voltage measurement by the microprocessor 10 is possible with the switch devices 8a, 8b, 8c for measurement operation provided in the high potential side wiring of the capacitors 2b, 2c, 2d to be measured being closed. And The timing of the voltage reading at the voltage measurement terminal of the microprocessor 10 is set to a timing slightly delayed after the switch devices 8a, 8b, 8c for measurement operation are closed.

グラウンド接続用のスイッチ装置７ａ，７ｂ，７ｃは、マイクロプロセッサ１０の「ＧＣ１」〜「ＧＣ３」の制御信号出力端子からの出力パルス信号で開閉操作され、その開閉操作のタイミングを図２でも「ＧＣ１」〜「ＧＣ３」で示している。
又、測定動作用のスイッチ装置８ａ，８ｂ，８ｃは、マイクロプロセッサ１０の「ＭＣ１」〜「ＭＣ３」の制御信号出力端子からの出力パルス信号で開閉操作され、その開閉操作のタイミングを図２でも「ＭＣ１」〜「ＭＣ３」で示している。
例えば、コンデンサ２ａについての電圧検出が完了する（図２の「Ａ／Ｄ１」参照）と、信号「ＧＣ１」でグラウンド接続用のスイッチ装置７ａを閉じ状態とし、それに引き続いて、信号「ＭＣ１」で測定動作用のスイッチ装置８ａを閉じ状態としている。
図２に示すように、以降の高電位側のコンデンサ２ｂ，２ｃ，２ｄについても同様の動作である。 The switch devices 7a, 7b and 7c for ground connection are opened / closed by output pulse signals from the control signal output terminals “GC1” to “GC3” of the microprocessor 10, and the timing of the opening / closing operation is shown in FIG. ] To “GC3”.
The switching devices 8a, 8b, 8c for measurement operation are opened / closed by output pulse signals from the control signal output terminals “MC1” to “MC3” of the microprocessor 10, and the timing of the opening / closing operation is shown in FIG. “MC1” to “MC3” are shown.
For example, when the voltage detection for the capacitor 2a is completed (see “A / D1” in FIG. 2), the switch device 7a for ground connection is closed by the signal “GC1”, and subsequently, the signal “MC1” is used. The switch device 8a for measurement operation is closed.
As shown in FIG. 2, the same operation is performed for the subsequent high potential side capacitors 2b, 2c, and 2d.

以上のようにして各単電池１ａ，１ｂ，１ｃ，１ｄの電圧が読取られると、断線検出部ＣＣとして機能するマイクロプロセッサ１０は、図３のステップ＃３で測定結果を受取り、記憶保持する。
この後、図２の「ＳＣ１」及び「ＳＣ２」で示すように、電位での並び順で低電位側から偶数番目（２番目と４番目）の補助電流経路６ｂ，６ｄに備えられている補助電流経路用のスイッチ装置４ｂ，４ｄを予め設定された時間の間だけ閉じ状態（ＯＮ状態）とし、電位での並び順で低電位側から奇数番目（１番目と３番目）の補助電流経路６ａ，６ｃに備えられている補助電流経路用のスイッチ装置４ａ，４ｃは開き状態（ＯＦＦ状態）を維持させる（ステップ＃４）。この補助電流経路用のスイッチ装置４ａ，４ｂ，４ｃ，４ｄの設定状態を、説明の便宜上、第２スイッチ設定状態と称する。
第２スイッチ設定状態は、上記第１スイッチ設定状態と開閉操作が逆になっており、電位での並び順において隣合う補助電流経路用のスイッチ装置４ａ，４ｂ，４ｃ，４ｄが同時に閉じ状態とならないようにしている。 When the voltages of the single cells 1a, 1b, 1c, and 1d are read as described above, the microprocessor 10 that functions as the disconnection detection unit CC receives the measurement result in step # 3 of FIG. 3, and stores and holds it.
Thereafter, as indicated by “SC1” and “SC2” in FIG. 2, the auxiliary current paths 6b and 6d provided in the even-numbered (second and fourth) auxiliary current paths 6b and 6d from the low potential side in the arrangement order of the potentials. The switch devices 4b and 4d for the current path are closed (ON state) for a preset time, and the odd-numbered (first and third) auxiliary current paths 6a from the low potential side in the arrangement order of potentials. , 6c, the auxiliary current path switch devices 4a, 4c are maintained in the open state (OFF state) (step # 4). The setting state of the switch devices 4a, 4b, 4c, and 4d for the auxiliary current path is referred to as a second switch setting state for convenience of explanation.
In the second switch setting state, the opening / closing operation is reversed from that of the first switch setting state, and the adjacent auxiliary current path switch devices 4a, 4b, 4c, and 4d are closed at the same time. I try not to be.

次ぎに、ステップ＃２の測定処理と同一のサブルーチンを呼び出して、図２において「第２測定サイクル」として示すように、上述の電圧測定のための設定動作と全く同一の測定動作を行わせ（ステップ＃５）、各単電池１ａ，１ｂ，１ｃ，１ｄについての電圧の読取りデータを受け取る（ステップ＃６）。
ステップ＃３とステップ＃６との２回分の測定データが揃うと、断線の発生の有無を判定する（ステップ＃７）。 Next, the same subroutine as the measurement process in step # 2 is called to perform the same measurement operation as the setting operation for voltage measurement described above as shown as “second measurement cycle” in FIG. In step # 5), voltage reading data for each of the cells 1a, 1b, 1c, 1d is received (step # 6).
When the measurement data for two times at step # 3 and step # 6 are prepared, it is determined whether or not a disconnection has occurred (step # 7).

例えば、図１において符号Ａで示す位置で断線が発生したとすると、上記第１測定サイクルでは、図４（ａ）で示す回路で、単電池１ａ，１ｂからコンデンサ２ａ，２ｂに充電されることになる。
図４（ａ）の回路では、コンデンサ２ａに抵抗５ａが並列に接続されることになるので、最終的には、コンデンサ２ａには充電されず、コンデンサ２ｂには、単電池１ａ，１ｂの電圧で充電される。
従って、上記第１測定サイクルでは、単電池１ａの電圧として検出したコンデンサ２ａの電圧はほぼ０Ｖの非常に低い電圧となり、単電池１ｂの電圧として検出したコンデンサ２ｂの電圧は通常の単電池の電圧よりも高い電圧（ほぼ２倍の電圧）となる。 For example, if a disconnection occurs at the position indicated by the symbol A in FIG. 1, the capacitors 2a and 2b are charged from the single cells 1a and 1b in the circuit shown in FIG. 4A in the first measurement cycle. become.
In the circuit of FIG. 4A, since the resistor 5a is connected in parallel to the capacitor 2a, the capacitor 2a is not charged in the end, and the voltage of the unit cells 1a and 1b is applied to the capacitor 2b. It is charged with.
Therefore, in the first measurement cycle, the voltage of the capacitor 2a detected as the voltage of the unit cell 1a is a very low voltage of approximately 0V, and the voltage of the capacitor 2b detected as the voltage of the unit cell 1b is the voltage of the normal unit cell. Higher voltage (approximately twice the voltage).

次ぎに、上記第２測定サイクルでは、図４（ｂ）で示す回路で、単電池１ａ，１ｂからコンデンサ２ａ，２ｂに充電されることになる。
図４（ｂ）の回路では、コンデンサ２ｂに抵抗５ｂが並列に接続されることになるので、最終的には、コンデンサ２ｂには充電されず、コンデンサ２ａには、単電池１ａ，１ｂの電圧で充電される。
従って、上記第２測定サイクルでは、単電池１ａの電圧として検出したコンデンサ２ａの電圧は通常の単電池の電圧よりも高い電圧（ほぼ２倍の電圧）となり、単電池１ｂの電圧として検出したコンデンサ２ｂの電圧はほぼ０Ｖの非常に低い電圧となる。 Next, in the second measurement cycle, the capacitors 2a and 2b are charged from the single cells 1a and 1b by the circuit shown in FIG. 4B.
In the circuit of FIG. 4B, since the resistor 5b is connected in parallel to the capacitor 2b, the capacitor 2b is not charged in the end, and the voltage of the single cells 1a and 1b is applied to the capacitor 2a. It is charged with.
Therefore, in the second measurement cycle, the voltage of the capacitor 2a detected as the voltage of the unit cell 1a is higher than the voltage of the normal unit cell (approximately twice the voltage), and the capacitor detected as the voltage of the unit cell 1b. The voltage of 2b is a very low voltage of almost 0V.

図３のステップ＃７では、各単電池１ａ，１ｂ，１ｃ，１ｄの上記第１測定サイクル及び上記第２測定サイクルでの検出電圧（実際には、夫々が対応する各コンデンサ２ａ，２ｂ，２ｃ，２ｄの検出電圧）において、対応する補助電流経路用のスイッチ装置４ａ，４ｂ，４ｃ，４ｄが開き状態のときの検出電圧と閉じ状態のときの検出電圧との差をとり、その差電圧が設定値（例えば、０．７Ｖ）より大きいときに、断線が発生したものと判断する。
図４に示す例では、単電池１ａ及び単電池１ｂについての電圧測定結果から、断線が発生したものと判断すると共に、断線が発生している位置も特定できる。
すなわち、単電池１ａの高電位側（すなわち、単電池１ｂの低電位側）の配線で断線が発生していることを特定できる。
尚、対応する補助電流経路用のスイッチ装置４ａ，４ｂ，４ｃ，４ｄが開き状態のときの検出電圧と閉じ状態のときの検出電圧との差をとるのではなく、対応する補助電流経路用のスイッチ装置４ａ，４ｂ，４ｃ，４ｄが閉じ状態のときの検出電圧値が設定値よりも低いことのみによって断線が発生していると判断することも可能である。 In step # 7 of FIG. 3, the detected voltages (actually, the respective capacitors 2a, 2b, 2c to which the respective cells 1a, 1b, 1c, 1d correspond in the first measurement cycle and the second measurement cycle). , 2d detection voltage), the difference between the detection voltage when the corresponding auxiliary current path switch device 4a, 4b, 4c, 4d is in the open state and the detection voltage when it is in the closed state is obtained. When it is larger than a set value (for example, 0.7 V), it is determined that a disconnection has occurred.
In the example shown in FIG. 4, it is determined from the voltage measurement results for the unit cells 1 a and 1 b that the disconnection has occurred, and the position at which the disconnection has occurred can be specified.
That is, it is possible to specify that a disconnection has occurred in the wiring on the high potential side of the unit cell 1a (that is, the low potential side of the unit cell 1b).
It should be noted that the corresponding auxiliary current path switch device 4a, 4b, 4c, 4d is not the difference between the detection voltage when the switch device 4a, 4b, 4c, 4d is in the open state and the detection voltage when the switch device is in the closed state. It is also possible to determine that a disconnection has occurred only because the detected voltage value when the switch devices 4a, 4b, 4c, and 4d are in the closed state is lower than the set value.

断線が発生していると判断した場合は（ステップ＃８）、図示を省略する上位の管理装置へその旨を報知する（ステップ＃９）。
以上、上記第１測定サイクルでは電位の並び順において奇数番目の補助電流経路６ａ，６ｃのスイッチ装置４ａ，４ｃを閉じ状態とし、上記第２測定サイクルでは電位の並び順において偶数番目の補助電流経路６ｂ，６ｄのスイッチ装置４ｂ，４ｄを閉じ状態とする場合を説明したが、この奇数番目と偶数番目とを入れ替えてスイッチ装置を開閉操作しても良い。 If it is determined that a disconnection has occurred (step # 8), the fact is notified to a higher-level management device (not shown) (step # 9).
As described above, in the first measurement cycle, the switch devices 4a and 4c of the odd-numbered auxiliary current paths 6a and 6c are closed in the order of potential arrangement, and the even-numbered auxiliary current paths in the order of potential arrangement in the second measurement cycle. Although the case where the switch devices 4b and 4d of 6b and 6d are set in the closed state has been described, the odd-numbered and even-numbered devices may be switched to open and close the switch device.

〔別実施形態〕
上記実施の形態では、補助電流経路６ａ，６ｂ，６ｃ，６ｄとして、組電池１を構成する各単電池１ａ，１ｂ，１ｃ，１ｄの電圧バランスをとるための回路部分を兼用する場合を例示しているが、別個独立に設けても良い。 [Another embodiment]
In the above embodiment, the auxiliary current paths 6a, 6b, 6c, and 6d are exemplified by the case where the circuit portion for balancing the voltages of the single cells 1a, 1b, 1c, and 1d constituting the assembled battery 1 is also used. However, it may be provided separately.

本発明の実施の形態にかかる組電池監視装置の回路構成図The circuit block diagram of the assembled battery monitoring apparatus concerning embodiment of this invention 本発明の実施の形態にかかるタイミングチャートTiming chart according to an embodiment of the present invention 本発明の実施の形態にかかるフローチャートThe flowchart concerning embodiment of this invention 本発明の実施の形態にかかる動作説明用の回路図FIG. 3 is a circuit diagram for explaining the operation according to the embodiment of the present invention. 断線が発生したときの動作を説明するための図Diagram for explaining operation when disconnection occurs 断線の検出を説明するための図Diagram for explaining detection of disconnection

符号の説明Explanation of symbols

１ 組電池
１ａ，１ｂ，１ｃ，１ｄ 単電池
４ａ，４ｂ，４ｃ，４ｄ 補助電流経路用のスイッチ装置
６ａ，６ｂ，６ｃ，６ｄ 補助電流経路
ＣＣ 断線検出部
ＭＵ 電圧測定部 1 battery assembly 1a, 1b, 1c, 1d single cell 4a, 4b, 4c, 4d auxiliary current path switch device 6a, 6b, 6c, 6d auxiliary current path CC disconnection detection section MU voltage measurement section

Claims (2)

複数の単電池を直列に接続した組電池における各単電池の正極及び最も低電位側の単電池の負極から引き出された配線を経て各単電池の電圧を電圧測定のための設定動作を行って検出する電圧測定部と、前記電圧測定のための設定動作によって得られる検出電圧に基づいて前記配線の断線の有無を検出する断線検出部とを備えた組電池監視装置であって、
前記単電池の夫々と並列に設定抵抗値を有する補助電流経路が接続され、
前記補助電流経路の夫々における通電を入り切りする補助電流経路用のスイッチ装置が前記補助電流経路の夫々に備えられ、
前記断線検出部は、前記補助電流経路用のスイッチ装置を、電位での並び順において隣り合うものが同時に閉じ状態とならないように開閉操作し、且つ、前記電圧測定のための設定動作によって得られる前記補助電流経路用のスイッチ装置を閉じ状態としたときの検出電圧と前記補助電流経路用のスイッチ装置を開き状態としたときの検出電圧との差に基づいて、前記配線の断線の有無を検出するように構成されている組電池監視装置。 In the assembled battery in which a plurality of cells are connected in series, the voltage of each cell is set for voltage measurement through the wiring drawn from the positive electrode of each cell and the negative electrode of the lowest potential cell. An assembled battery monitoring device comprising: a voltage measuring unit for detecting; and a disconnection detecting unit for detecting presence or absence of disconnection of the wiring based on a detection voltage obtained by a setting operation for the voltage measurement,
An auxiliary current path having a set resistance value is connected in parallel with each of the unit cells,
A switch device for an auxiliary current path that turns on and off energization in each of the auxiliary current paths is provided in each of the auxiliary current paths,
The disconnection detection unit is obtained by opening and closing the switch device for the auxiliary current path so that adjacent ones in the arrangement order of potentials are not closed at the same time, and by the setting operation for the voltage measurement. on the basis of the difference between the detected voltage when the detected voltage and the open state of the switching device for the auxiliary current path when the state closes the switch device for the auxiliary current path that, the presence or absence of disconnection of the wiring An assembled battery monitoring device configured to detect. 複数の単電池を直列に接続した組電池における各単電池の正極及び最も低電位側の単電池の負極から引き出された配線を経て各単電池の電圧を電圧測定のための設定動作を行って検出し、前記電圧測定のための設定動作によって得られる検出電圧に基づいて前記配線の断線の有無を検出する組電池用配線の断線検出方法であって、In the assembled battery in which a plurality of cells are connected in series, the voltage of each cell is set for voltage measurement through the wiring drawn from the positive electrode of each cell and the negative electrode of the lowest potential cell. A method for detecting disconnection of a wiring for an assembled battery that detects and detects the presence or absence of disconnection of the wiring based on a detection voltage obtained by a setting operation for measuring the voltage,
前記単電池の夫々と並列に設定抵抗値を有する補助電流経路が接続され、  An auxiliary current path having a set resistance value is connected in parallel with each of the unit cells,
前記補助電流経路の夫々における通電を入り切りする補助電流経路用のスイッチ装置が前記補助電流経路の夫々に備えられ、  A switch device for an auxiliary current path that turns on and off energization in each of the auxiliary current paths is provided in each of the auxiliary current paths,
前記補助電流経路用のスイッチ装置を、電位での並び順において隣り合うものが同時に閉じ状態とならないように開閉操作し、且つ、前記電圧測定のための設定動作によって得られる前記補助電流経路用のスイッチ装置を閉じ状態としたときの検出電圧と前記補助電流経路用のスイッチ装置を開き状態としたときの検出電圧との差に基づいて、前記配線の断線の有無を検出する組電池用配線の断線検出方法。  The auxiliary current path switch device is opened and closed so that adjacent ones in the arrangement order of potentials are not simultaneously closed, and the auxiliary current path switch obtained by the setting operation for voltage measurement is used. Based on the difference between the detection voltage when the switch device is in the closed state and the detection voltage when the switch device for the auxiliary current path is in the open state, the wiring for the assembled battery that detects the presence or absence of disconnection of the wiring Disconnection detection method.
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